/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [https://neo4j.com]
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.neo4j.cypher.internal.expressions

sealed trait SemanticDirection {
  def reversed: SemanticDirection
  def leftArrowCanonicalString: String
  def rightArrowCanonicalString: String
}

case object SemanticDirection {

  case object OUTGOING extends SemanticDirection {
    override def reversed: SemanticDirection = INCOMING
    override def leftArrowCanonicalString: String = "-"
    override def rightArrowCanonicalString: String = "->"
  }

  case object INCOMING extends SemanticDirection {
    override def reversed: SemanticDirection = OUTGOING
    override def leftArrowCanonicalString: String = "<-"
    override def rightArrowCanonicalString: String = "-"
  }

  case object BOTH extends SemanticDirection {
    override def reversed: SemanticDirection = BOTH
    override def leftArrowCanonicalString: String = "-"
    override def rightArrowCanonicalString: String = "-"
  }
}
